CBSE Questions for Class 11 Medical Biology Plant Growth And Development Quiz 17 - MCQExams.com

Find out correct options.
   I     II     III
aFoolish plantpVolatile hormonexInduces dormancy
bInduces senescenceqAbscisic acidyRipens fruit
c. EthylenerGibberellazUsually sterile plant
  • a- p- y, b- r- x, c-q-z
  • a- r- z, b- q- z, c-p-y
  • a- r- z, b- p- y, c-q-z
  • a- q- x, b- r- y, c-p-z
One hormone hastens the maturity period in juvenile conifers, a second hormone controls xylem differentiation while the third increases the tolerance of plants to various stresses. They are respectively
  • Auxin, gibberellin and cytokinin
  • Gibberellin, auxin, cytokinin
  • Gibberellin, auxin, ethylene
  • Gibberellin, auxin, ABA
  • Auxin, gibberellin, ABA
Which is not the effect of ethylene?
  • Promotes senescence and abscission of plant organs
  • Breaks seed and bud dormancy
  • Brings about horizontal growth of seedlings
  • Hastens fruit ripening
  • Helps to overcome apical dominance
The hormone that promotes rapid elongation of intermodes or leaf base in deep water rice plant is 
  • Abscisic acid
  • Ethylene
  • Cytokinin
  • Gibberellin
During seed germination, its stored food is mobilised by
  • Gibberellin
  • Ethylene
  • Cytokinin
  • ABA
Match the columns and choose the correct combination.
Growth Regulator   Action
$$(a)$$Abscisic acid$$(1)$$Delays leaf abscission
$$(b)$$Ethylene$$(2)$$Inhibits seed germination
$$(c)$$Cytokinin$$(3)$$Herbicide
$$(d)$$Auxin$$(4)$$Hastens fruit ripening
  • $$a - 2, b - 4, c - 1, d - 3$$
  • $$a - 1, b - 2, c - 3, d - 4$$
  • $$a - 2, b - 3, c - 4, d - 1$$
  • $$a - 2, b - 1, c - 3, d - 4$$
  • $$a - 3, b - 4, c - 1, d - 2$$
Cholodony and Went effect is due to
  • IAA
  • GA
  • Cytokinin
  • ABA
Two different plants associated with discovery of two different phytohormones having common biosynthetic precursor exhibit one of the following characters each
I. Versatile anthers  II. Compound spadix  III. Pentalocular ovary  IV. Trifoliate compound leaves
  • II and III
  • I and III
  • II and IV
  • I and IV
Match the lists and find the correct options.
         I            II
a. Early seed production in conifersi. Indole substance
b. Seed development and maturationii.Terpene substance
c. Lateral shoot growthiii. Volatile substance
d. Root hair formationiv. Adenine derivative

 v.Carotenoid derivative
  • a - iii, b - i, c - v, d - ii
  • a - ii, b - v, c - iv, d - iii
  • a - ii, b - i, c - v, d - iv
  • a - iv, b - iii, c - ii, d - i
Which one is growth regulator produced by plants?
  • NAA
  • Zeatin
  • 2, 4-D
  • BAP
Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of a freshly cut coleoptile stumps. Of what significance is this experiment.
  • It is basis of quantitative determination of small amounts of growth promoting substances
  • It supports the hypothesis that IAA is auxin
  • It demonstrated polar movement of auxins
  • It made possible the isolation and exact identification of auxin
Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings is brought about by
  • Auxins
  • Gibberellins
  • Ethylene
  • Kinetin
  • Abscisic acid
Identify the correct pair of combinations.
(i) Zeatin - adenine derivative - overcoming apical dominance
(ii) $${C}_{2}{H}_{4}$$ - indole compound - effective in fruit ripening
(iii) ABA - carotenoid derivative - induction of parthenocarpy
(iv) $$G{A}_{3}$$ - terpene - bolting in cabbage
  • ii, iii
  • ii, iv
  • i, iv
  • iii, iv
The cells derived from meristems differentiate and regain the capacity to divide by a phenomenon called
  • Differentiation
  • Dedifferentiation
  • Redifferentiation
  • Totipotency
  • Regeneration
Biosynthesis of cytokinin takes place via
  • Mevalonic acid cycle
  • Citric acid cycle
  • Calvin cycle
  • $${C}_{4}$$ cycle
Plant hormones used for inducing morphogenesis in plant tissue culture is
  • Gibberellins
  • Ethylene
  • Cytokinins
  • ABA
Mature differentiated cells revert to meristematic activity to form callus by
  • Differentiation
  • Cytodifferentiation
  • Redifferentiation
  • Dedifferentiation
Which can prevent, premature fruit fall?
  • $$GA_3$$
  • Zeatin
  • Ethylene
  • NAA
Choose the correct answer from the alternatives given.
The main effect of auxin is to stimulate cell:
  • division
  • elongation
  • turgor
  • differentiation
Sprouting of potato under storage condition can be prevented by
  • auxin
  • gibberellin
  • ethylene
  • cytokinin
Allelopathy is caused by release of
  • Poison
  • Toxin
  • Pheromone
  • Chemicals
Choose the correct answer from the alternatives given.
A hormone that causes cell division and is found in coconut milk or in dividing root tissue is:
  • abscisic acid
  • auxin
  • cytokinin
  • gibberelthi
Hormone responsible for ageing in plants is
  • GA
  • IAA
  • ABA
  • Cytokinin
Choose the correct answer from the alternatives given.
Which of the following is true regarding gibberellins?
  • There are about 70 chemically different gibberellins
  • They are growth promoters causing cell elongation
  • These hormones can break seed and bud dormancy
  • All of the above.
Choose the correct answer from the alternatives given.
IAA travels:
  • basipetally
  • acropetally
  • macropetally
  • overpetally
State whether the following statements are true or false.
The plant ageing process, senescence, is prevented by cytokinins.
  • True
  • False
State whether the following statements are true or false.
If a plant is laid on its side, cells on the lower side of the stem will respond to gravity and elongate, making the stem turn so that it continues to grow upward.
  • True
  • False
Ethylene promotes water absorption by increasing the root's absorption surface. It promotes:
  • Premability of cell membrane
  • Rormation of root hairs
  • Concentration of cell sap
  • All of these
Which one is paired incorrectly?
  • Auxin - Isolated from human urine
  • Zeatin - Isolated from corn kernels and coconut milk
  • Gibberellins - Isolated from fungus G. fujikori
  • Abscisic acid - Isolated from ripened oranges
ABA is degraded into 
  • Mallic acid
  • Oxalic acid
  • Phaseic acid
  • None of the above
Select the correct statement(s) regarding auxins.
  • Auxins promote root growth only at extremely low concentrations and they inhibit root growth at higher concentrations.
  • Concentration of auxins which is inhibitory to root growth causes initiation of adventitious roots from the nodes or basal regions of stem.
  • Auxins such as NAA and IBA are used to induce rooting in stem cuttings.
  • All of the above.
Select the correct option regarding the phytohormone to which the given molecular structure belongs.

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  • The hormone promotes femaleness in most flowers.
  • The hormone promotes apical dominance.
  • The hormone usually decreases the size of stem, leaves, flowers and fruits.
  • The hormones breaks seed dormancy by synthesis of certain enzymes.
Which one of the following is a synergistic effect of gibberellin and ethylene
  • Breaking of seed dormancy
  • Senescence
  • Sex-expression
  • None of the above
Study the following structure below and find out how many of them are the product of 
(A) Differentiation 
(B) Redifferentiation 
(C) Dedifferentiation.

Cortex, phelloderm, secondary cortex, secondary phloem, primary medullary rays, interfascicular cambium, phellem, and endodermis
  • A=3 B= 1 C =4
  • A=2 B=1 C=5
  • A=3 B=3 C=2
  • A=4 B=3 C=1
If a shoot cutting is treated with auxin, which of the following is likely to result?
  • Extensive root production
  • Suppression of apical
  • Growth and lateral buds
  • Bolting of the shoot
Select the incorrect statement among the following.
  • Increase in growth per unit time is growth rate.
  • A sigmoid growth curve is a characteristic of most living organisms in their natural environment.
  • Rate of growth is constant during geometrical growth.
  • Exponential phase is also called as log phase.
Which of the following hormones regulate stomatal colour?
  • Auxins
  • GA
  • ABA
  • Cytokinin
Match the Column-I and Column-II.
Column-IColumn-II
(i) Auxin(A) Adenine derivatives
(ii) Gibberellin(B) Carotenoid derivatives
(iii) Cytokinin(C) Terpins
(iv) ABA(D) Indole compounds
  • i-B, ii-A, iii-D, iv-C
  • i-D, ii-B, iii-A, iv-C
  • i-B, ii-A, iii-C, iv-D
  • i-D, ii-C, iii-A, iv-B
Which of the following hormones regulate stomatal closure?
  • auxins
  • GA
  • ABA
  • cytokinins
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